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<H1>Top-Down Construction of PDA from Context-Free Grammar</H1>
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Let <IMG  ALIGN=MIDDLE ALT="" SRC="img1.gif">.  Assume all the productions in <b>P</b>, not of the form
<IMG  ALIGN=BOTTOM ALT="" SRC="img2.gif">, are numbered 1 to <b>m</b>.
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The PDA <IMG  ALIGN=MIDDLE ALT="" SRC="img3.gif"> will accept
the language generated by <b>G</b>.  We need to specify <b>Q</b> and <IMG  ALIGN=BOTTOM ALT="" SRC="img4.gif">.
<P><IMG  ALIGN=BOTTOM ALT="" SRC="img5.gif"><P>
The function <IMG  ALIGN=BOTTOM ALT="" SRC="img6.gif"> consists of the following rules:
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<P><ADDRESS>
<I>James Fix <BR>
Mon Mar  4 14:26:16 PST 1996</I>
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